GMC Sierra Complaints

15,732 consumer complaints on file.

#11727495March 27, 2026
FORWARD COLLISION AVOIDANCE, ELECTRICAL SYSTEM
The contact owns a 2022 GMC Sierra 1500. The contact stated that while driving at various speeds, the driver's side seat vibrated, and the automatic high beam feature disengaged, and the lane change indicator became inoperable. The message " Crash Sensor System Inoperable" was displayed. The dealer was notified of the failure and advised the contact to temporarily disconnect the battery. The contact followed the instruction; however, the failure recurred a day later. The vehicle was taken to the dealer, where it was diagnosed, and determined that there was a glitch in the crash sensor system. The dealer determined that the system needed to be updated. The vehicle was repaired out-of-pocket. The manufacturer was contacted and informed the contact that the failure was a maintenance issue, and the repair was at the owner's expense. The failure mileage was approximately 51,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727522March 27, 2026
POWER TRAIN, ENGINE
Incident Summary: On 2/2/2026, my vehicle was serviced under Safety Recall 25V-274 at an authorized GMC dealership. The service technician performed the mandated diagnostic protocol (including the PicoScope test) and informed me that the engine had "passed" inspection. No internal components were replaced; the remedy was limited to an oil change to a higher-viscosity oil (0W-40) and a new oil filler cap. The Failure: Approximately 48 hours after this "successful" recall remedy, the vehicle suffered a catastrophic engine failure while in operation. The engine failed entirely. The vehicle lost all propulsion while in motion, creating an immediate safety hazard for myself and other motorists. Diagnostic and Risk: The failure has been confirmed by a GMC dealer, who subsequently performed a full engine and radiator replacement. In the 48-hour prior to failure, there were no warning lamps or symptoms; the vehicle had just been cleared by the manufacturer's own diagnostic tools as safe and free of defects. Systemic Concern: This incident demonstrates that the current diagnostic protocol for Recall 25V-274 is insufficient to identify terminal manufacturing defects in the connecting rods and crankshaft of the L87 6.2L V8 engine. The "remedy" of higher-viscosity oil failed to prevent the exact catastrophic loss of propulsion the recall was intended to address. The replaced engine is available for inspection upon request by the NHTSA Office of Defects Investigation.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727566March 27, 2026
ELECTRICAL SYSTEM
THE PARK ASSIST WOULD GO ON WHEN I WAS AT A STOP LIGHT AND NO ONE WAS IN FRONT OF ME AND AUTO STOP WAS OFF ALL THE TIME. TWO GROUND STRAPS WERE CORRODED. THERE IS A RECALL ON THEM FROM 2019 TO 2024. MY TRUCK DID NOT HAVE A RECALL ON IT. I JUST WANT TO LET YOU KNOW AND MAYBE IF ENOUGH PEOPLE COMPLAIN, YOU WILL PUT ALL TRUCKS ON THE RECALL.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727604March 27, 2026
STRUCTURE:BODY, STRUCTURE:EXTERIOR TRIM
The grille deflector flew off while driving. The same exact problem the 2022 sierra had as described in N242490120
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727173March 26, 2026
ENGINE
Engine Failure at 18,000. Knocking noise started immediately followed by vehicle going into low power mode. Dangerous to drive in traffic in low power mode. No other warning lamps or indications that something was wrong. Dealer inspected and found a bearing went out in the engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727180March 26, 2026
ENGINE
6.2L Engine has well documneted problem with the valvetrane, I have had to fix it 2 times in 3 months. I have pictures and documents from servicing dealerships. Since my ownership, it has always been dealer-serviced. Unexpected catastrophic engine failure, which happened on a major interstate. GM service technicians know there is a valvetrane issue. This instance, the warning light came on under and overpass, and the truck coasted to a stop just past the end of the on-ramp. A GM (Chevrolet dealership currently has it) and a GMC dealership has serviced it since my ownership.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727195March 26, 2026
ELECTRICAL SYSTEM
Radio has zero sound - the issue is the radio sound also has the blinker sound, hands free safety/navigation guidance along with the On Star safety function. None of that is functional. The dealer states it's a known issue and parts are not available. How can this be when they keep building new units. GM has been contacted with zero help and no response around my safety concerns. While it seems like a small thing when we say radio I'm not concerned with the lack of music but this system controls way more than music.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727290March 26, 2026
ENGINE
The truck currently has 48000 miles. The 6.2L L87 engine was replaced at 17000 miles. A few weeks ago, I parked it, went to a ballgame, came back 4 hours later and started the truck. Drove it approximately 500 feet and lights started flashing on the dash. It was running rough, had loos of power, and sounded like a diesel. I immediately shut it off and had it towed to a dealer. The lifter on the number 3 cylinder stuck and bent the pushrod. The dealer replaced all lifters on that side of the engine. This all happened after it was checked for the recall and the thicker oil was put in.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727368March 26, 2026
POWER TRAIN
While driving a "Service Transmission" message appears on the information center. The truck shifts slowly, sometimes slamming into gear, doesn't seem to have smooth acceleration through the gears until a high gear is reached. Unusual sounds occur during the shifting sequence. The vehicle was dropped off at the dealer for service. Dealer claims that since they were not able to duplicate the conditions reported to them, the vehicle was fine and not in need of any further investigation or service. Transmission problems are a known concern with vehicle as recalls have been expanded to include this class of truck in the recall but GM is not including this vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726902March 25, 2026
ENGINE
Our truck had just passed 60,000 miles when the engine seized. The recall procedure was completed in January, and the engine passed the test at that time. We were also using the recommended 0W‑40 oil. Despite following all guidelines, the engine still failed. This shows that the procedure GM has outlined is not sufficient to determine whether an engine is actually in good condition.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726911March 25, 2026
SERVICE BRAKES, VEHICLE SPEED CONTROL
At speeds of 65-75, both with the adaptive cruise control enabled and disabled, I accelerated a little bit to pick up speed and pass another vehicle. The vehicle responded initially by gaining speed, then it feels like I hit something and the front brakes lock up for 1-2 seconds and the tires start screeching from sliding, then everything resumes to normal. I was very shocked during a recent roadtrip when this happened 4-5 times. I feel like my safety and my family’s safety is at risk and of the 2 dealerships I called, they don’t prioritize it and make it seem like a minor repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726967March 25, 2026
ENGINE
Driving on Interstate at a speed of 70 when truck lost power. Check engine light came on and other lights on dash came on also. 2007 with 160k miles original barely driven. This year should be a part of the Class Action Suit
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726971March 25, 2026
ENGINE
Driving on Interstate at a speed of 65, truck lost power. Check engine light and all lights on dash appeared I initially mistakenly reported the wrong mileage of 160k. My vehicle only has 135k miles on it
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726603March 24, 2026
ENGINE
Driving on the interstate at speed and all of a sudden a loss of power, Christmas tree of lights on the dash and low oil pressure alarms. Engine now needs replacement.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726627March 24, 2026
ENGINE, ELECTRICAL SYSTEM
The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving approximately 50-65 MPH on an incline, the contact believed that the transmission was slipping or there was a misfire coming from the engine. The contact stated that the vehicle failed to restart automatically after the engine AUTO Start/Stop system was engaged after a complete stop. Additionally, the contact stated that after driving for a while, the vehicle went into LIMP Mode. The check engine warning light and other warning lights were illuminated. The vehicle was taken to the dealer to be diagnosed. The contact related the failure to GM Campaign Number: N252515590 (Corroded Ground Strap); however, the dealer had informed the contact that the vehicle was not covered because the VIN was not included and there was no warranty coverage on the vehicle. The vehicle was not yet diagnosed or repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 75,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726656March 24, 2026
ENGINE
While traveling northbound on I‑65 on Saturday, 1/31, the 6.2L V8 engine in my 2023 GMC Sierra AT4 experienced a sudden and complete internal failure. My husband was driving and I was in the vehicle with him when the engine lost all power without any warning lights, messages, or prior symptoms. We were only able to coast into a very busy on‑ramp merge lane before the truck died completely, leaving us stranded in an active traffic area for over two hours on one of the coldest days of the year, which created a significant safety risk for both of us and for other drivers. My truck was towed to the dealership. They inspected the vehicle, confirmed it was a full engine failure, and replaced the engine under warranty. The failed engine only had just over 37,000 miles on it at the time of the incident. GM was notified through the dealer’s warranty process. No other agencies have inspected the vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726714March 24, 2026
POWER TRAIN
While driving on the highway at normal speed, my vehicle was operating completely normally with no warning lights, messages, or prior issues. Without any warning, the vehicle suddenly lost the ability to accelerate and felt as if it had been shifted into neutral. I immediately had to pull over to the side of the highway, as this created a dangerous situation with surrounding traffic. The vehicle had to be towed to a mechanic. Upon inspection, I was informed that a coolant line connected to the transmission had completely blew off, causing a rapid loss of transmission fluid and resulting in total transmission failure. I was told this was not due to a rusted or deteriorated clamp, but rather a sudden component failure. This vehicle has been meticulously maintained and I have owned it for less than one year. There were no prior symptoms, leaks, or warning signs leading up to this incident. This appears to be a sudden and unexpected mechanical failure, not caused by neglect or misuse. The loss of power while driving at highway speed posed a serious safety risk to myself and others on the road.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726720March 24, 2026
ENGINE
While driving on the highway my 2026 GMC Sierra 1500 Denali Ultimate the vehicle lost propulsion and the dashboard went dark because it shut off. I was exiting the highway onto a skybridge and rolled to a stop before reaching the top on the skybridge. Vehicle would not start again and needed to be towed. Dealership concluded my 6.2L V8 engine needed to be replaced due to crank shaft seizing. Engine had 1861 miles. This put me in a very dangerous situation due to the limited space on the skybridge with passing traffic.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726731March 24, 2026
TIRES, TIRES:TREAD/BELT
Tires are LT275/65R20. While driving on interstate at approximately the speed limit and low 80 degree temperatures in South Carolina with proper placard pressure tire inflation checked two days prior, the truck developed a faint vibration which got worse over three or four miles. I slowed my speed and pulled over at next offramp and visually inspected truck for signs of vibration. Including looking over tires. It seemed like a drive line issue, however truck is a 2021 model with only 38,000 miles. After I could not find anything out of place I got back on the interstate to see if problems still existed. I was only traveling at 45 mph and vibration was getting worse, so I tried to slow and make it to next offramp when the driver side tire blew out causing me to have to quickly react to prevent having an accident. The tire tread and multiple parts of the truck inner fender guards and liner were thrown out into traffic and truck bed side is badly damaged. Prior to blow out there were no warnings on the dash board to to indicate any sort of issue and I verified tire pressures when I stopped after the vibration initially set in. The TPMS system was working properly at the time of the blowout. I have the tire if further inspection is warranted. My safety was at risk when tire blew out on the interstate along with vehicles traveling around me to avoid hitting the flying debris and tire tread. Further this was driver side tire and I had to change the tire on the side of the interstate with traffic right beside my vehicle. I called GMC and they said they would do nothing to help because they see tires as a maintenance item and truck is out of warranty period. I am a mechanical engineer having worked many years for major tire company as a tire design engineer. I am very familiar with load ratings, tire wear, life expectancies, and I believe theis tires failed prematurely. I bought this truck new and have always had tires properly inflated a never overloaded.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726779March 24, 2026
POWER TRAIN
The transmission valve body was trying to lock up while driving and making it shimmy and shift hard. I took it to Davis GMC in [XXX] . They diagnosed it with the transmission malfunction (this is the same transmission that is under recall in the 2020 models)j. I paid $8660.33 to have them replace the transmission. It has been approximately 6 months and 6.000 miles and now this transmission is shuttering, also. I took it back to Davis GMC and the technician told me that I didn't know how to drive a 10 speed automatic! I then took it to TriLakes Motor in [XXX] where they made an adjustment on it. That has not fixed the problem. Today I contacted the main GMC center and started a case number: XXX. They suggessted taking it back to a dealership again and trying to get it fixed again. I feel like I am stuck with a truck that can not be fixed and should be in the recall due to it having the same transmission as the other GMC Sierra's that are under recall. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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